usb8x is a free, open source application for the TI-84 Plus calculators. It combines a low level driver to support the calculator's USB port with a limited selection of device drivers. It is designed with two goals in mind: First, to allow programmers to create external applications/programs that use USB devices without any knowledge of the low-level workings of those devices or the USB port itself. Second, to allow programmers to create additional drivers for other USB hardware not currently supported natively in usb8x.